Khadzhiivanov, Nikolay, and Nedyalko Nenov. “LETTER TO THE EDITOR. TURAN’S THEOREM AND MAXIMAL DEGREES”. Ann. Sofia Univ. Fac. Math. and Inf. 96 (December 12, 2004): 173–174. Accessed January 15, 2025. https://admin.uni-sofia.bg/index.php/fmi/article/view/171.